﻿Imports System.IO

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim al As Integer = Asc("A")
        For I = al To al + 25
            Dim d As New DriveInfo(Chr(I))
            If d.DriveType = (DriveType.Unknown Or DriveType.NoRootDirectory) Then
                ComboBox1.Items.Add(d.Name)
            End If
        Next
    End Sub
End Class
